1. Centers for Disease Control: Sexually transmitted diseases treatment guidelines;MMWR,1989
2. Centers for Disease Control: Continuing increase in infectious syphilis—United States;MMWR,1988
3. Centers for Disease Control: Genital herpes infection—United States, 1966-1984;MMWR,1986
4. Centers for Disease Control: Unpublished statistics
5. The microbiological flora of penile ulcerations;Chapel;J Infect Dis,1978